Difference between revisions of "KA650 CPU"

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The KA650 CPU module is a [[DEC card form factor|quad]]-height [[QBUS]] [[VAX]] CPU produced by [[DEC]]. [[#ref_4|[4]]]
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The '''KA650''' is the [[Central Processing Unit|CPU]] used in [[Digital Equipment Corporation|DEC]]'s [[MicroVAX III]]. It is a single [[DEC card form factor|quad]]-height [[printed circuit board|PCB]] which plugs into a [[QBUS]] [[backplane]]. [[#ref_4|[4]]]
  
 
The KA650 is implemented using the [[CVAX]] with [[floating point]] [[instruction]] support provided by the [[CFPA]], [[main memory]] control provided by [[CMCTL]], and various system support functions by the [[SSC]].
 
The KA650 is implemented using the [[CVAX]] with [[floating point]] [[instruction]] support provided by the [[CFPA]], [[main memory]] control provided by [[CMCTL]], and various system support functions by the [[SSC]].

Revision as of 20:51, 24 November 2019


KA650
Summary
OS support (VMS): V4.7A or later
OS support (ULTRIX): ULTRIX V2.2
CPU Details
CPU name (VMS): KA650
CPU module: KA650
Module: M7620 [3]
Number of processors: 1
VMS DCL CPU: 10
VMS DCL XCPU: 1
SID: 0A000005
XSID: 01530101
CPU chip: 78034 (CVAX) [1]
FPU chip: 78132
CPU technology: CMOS
CPU cycle time: 90ns [4]
Instruction-buffer: 12 bytes [1]
Translation-buffer: 28 entries [1]
Cache: 1KB (90ns) [1]
Backup cache: 64KB (180ns longword, 270ns quadword) [4]
Compatibility mode: No
Console processor: CPU
Console device: None
Firmware version: V5.3
Console speed: 300 to 38400
Memory
Minimum memory: 8MB
Maximum memory: 64MB
Memory checking: 32 + 7 bit ECC [4]
Memory cycle: 450ns longword, 720ns quadword [4]
I/O
Q-bus: 1 @ 3.3MB/s
Performance
VUPs: 2.7 [2]


The KA650 is the CPU used in DEC's MicroVAX III. It is a single quad-height PCB which plugs into a QBUS backplane. [4]

The KA650 is implemented using the CVAX with floating point instruction support provided by the CFPA, main memory control provided by CMCTL, and various system support functions by the SSC.

Memory Subsystem

The KA650 memory subsystem is detailed elsewhere, DEC KA650 Memory Subsystem.

References

[1] "CVAX-based Systems", Digital Technical Journal, Vol 1 No 7, August 1988.
[2] VAXcluster Systems. Guidelines for VAXCluster System Configurations. EK-VAXCT-CG-006
[3] Field Maintenance Print Set: 650QS Pedestal, BA213. MP-02538-01
[4] KA650 CPU Module Technical Manual. EK-KA650-UG.003